Enhance script doc

extensions/web-scripts/readme.md

@@ -3,5 +3,47 @@ This extension provides a web page to create scripts.
 
 There are 3 types of scripts, `blocks`, `view` and `lua` each having a dedicated editor.
 
-A blocks extension is a server side extension composed with basic blocks to react to thing property value modifications.
-A view extension is a front-end extension composed with HTML to show thing property values.
+A `blocks` script is a server side extension composed with basic blocks to react to thing property value modifications.
+A `view` script is a front-end extension composed with HTML to show and interact with thing property values.
+A `lua` script is a raw extension.
+
+## Blocks
+
+This type of script allows to graphically define automatic behavior.
+
+You have access to generic Blockly components in the categories: Logic, Loops, Math, Text, List.
+You could also define Variables and Functions.
+You have specific categories: Data, Event, Expression.
+
+The Data category allows to get or set a thing property value or to watch the changes on a property value.
+* get: gets the thing property current value
+* set: sets the thing property value
+* watch: triggers an action on a thing property value change with the new value as parameter
+
+The Event category allows to react on an engine event, to trigger execution on a recurring schedule or a timer.
+* on: triggers an action on an engine event
+* every: triggers an action on a schedule, minutes hours days months weekdays, ex: */5 1,3 2-4
+* set timer: triggers an action after a delay, the timer is unique for the name and can be cancelled
+* clear timer: clears a timer
+
+## View
+
+This type of script allows to compose user interface using HTML code.
+
+In the configuration you could define an icon that will be used to present the view page in the default home page.
+You also define the title and the id that is used in the URL path.
+
+You could configure multiple mappings between a key and a thing property value. The key could be used in the HTML code to interact with the thing property.
+
+## Lua
+
+This type of script allows to create raw extension.
+
+The script receives the extension as a parameter.
+
+```lua
+local extension = ...
+```
+
+You then have access to the extension and Thing API.
+